Free music appreciation classes for all are being taught on YouTube by a set of 21-year-old twins in Gary, Indiana.

Titled “First Time Hearing: Twins the New Trend,” the video series finds Tim and Fred Williams — who grew up listening to the likes of rapper Twista and Lil Wayne — giving their heartfelt thoughts about songs they admittedly might never have heard.

Among the artists they’ve been discovering are Freddie Mercury and Queen, Luther Vandross, Tom Jones, opera star Luciano Pavarotti and Aerosmith — but that’s just the start.

“There’s more than just rap out there,” Fred tells PEOPLE. “There’s so much more than I ever thought.”

Of his new passion captured in the video series, Tim says, “We wanted to start a new trend to appreciate old music. We’re open to all genres. We also want to bring people together because there’s no color to music.”